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 | R421A08 8CH DC 12V RS485 Relay Module Modbus RTU 485 Remote Control Switch AUD 7.48 Category : Time Delay Relays Seller : eletechsup(1617, 100.0%) |  | R421A08 DC 12V 8 Channel RS485 Relay Module Modbus RTU Protocol 485 for PLC PTZ AUD 38.12 Category : General Purpose Relays Seller : obunjv(109, 96.8%) |